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Appendix F (Deschutes River Tmdls)

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Appendix F (Deschutes River Tmdls) Appendix F - Deschutes River Tributaries TMDLs Technical Analysis Appendix F Deschutes River Tributaries TMDLs Technical Analysis Appendix F - Deschutes River Tributaries TMDLs Technical Analysis TABLE OF CONTENTS 1.0 INTRODUCTION ..................................................................................................................................................1 1.1 Technical Approach Overview .......................................................................................................................1 2.0 WATER TEMPERATURE ....................................................................................................................................2 2.1 Technical Approach .......................................................................................................................................2 2.1.1 Geospatial and Monitoring Data ...........................................................................................................3 2.2 Technical Analysis .........................................................................................................................................6 2.2.1 TTools Application ................................................................................................................................6 2.2.2 Shade Modeling: Existing Conditions ...................................................................................................8 2.2.3 Shade Modeling: System Potential Vegetation ....................................................................................9 2.3 TMDLs: Thermal Heat ................................................................................................................................. 15 3.0 NUTRIENTS ...................................................................................................................................................... 16 3.1 Relationship between Nutrients, DO, and pH ............................................................................................. 16 3.1.1 Influencing Factors for DO ................................................................................................................. 16 3.1.2 Influencing Factors for pH ................................................................................................................. 16 3.1.3 Nutrients as a Surrogate for DO and pH ........................................................................................... 17 3.2 Technical Approach .................................................................................................................................... 17 3.3 Monitoring Data ........................................................................................................................................... 18 3.4 Technical Analysis ...................................................................................................................................... 19 3.5 TMDLs: Nutrients ........................................................................................................................................ 21 4.0 SOURCE ASSESSMENT ................................................................................................................................. 23 4.1 Summary of Permit Types........................................................................................................................... 25 4.2 Temperature ................................................................................................................................................ 25 4.3 Nutrients ...................................................................................................................................................... 26 4.4 Source Assessment Summary .................................................................................................................... 32 4.5 Wasteload Allocations ................................................................................................................................. 34 5.0 REFERENCES .................................................................................................................................................. 35 6.0 APPENDIX F-1: TABULAR SHADE DEFICIT AND THERMAL TMDL RESULTS ......................................... 37 i Appendix F - Deschutes River Tributaries TMDLs Technical Analysis LIST OF TABLES Table 1. Conceptual framework summary for waterbodies impaired for water temperature. ....................................3 Table 2. Geospatial data sources. ..............................................................................................................................4 Table 3. Monitoring records for tributaries impaired for water temperature (°C). .......................................................6 Table 4. Summary of tributary attribute results from TTools. .....................................................................................8 Table 5. Shade.xls model inputs for existing conditions of riparian land use/cover classes. .....................................9 Table 6. Longitudinal average daily effective shade deficits and solar heat loads during the critical period. ......... 11 Table 7. Effective shade targets and daily maximum solar heat TMDLs. ............................................................... 15 Table 8. Observed DO concentration data for waterbodies impaired for DO (mg/L). ............................................. 18 Table 9. Observed pH (s.u.) for waterbodies impaired for pH. ................................................................................ 18 Table 10. Observed TN for waterbodies impaired for DO and/or pH (mg/L)........................................................... 19 Table 11. Observed TP for waterbodies impaired for DO and/or pH (mg/L). .......................................................... 19 Table 12. TN and TP TMDLs for waterbodies impaired for DO and/or pH. ............................................................ 21 Table 13. NPDES permitted stormwater sources. ................................................................................................... 24 Table 14. Existing heat load and effective shade within the MS4 boundaries. ....................................................... 26 Table 15. Permitted MS4s in catchments of waterbodies impaired for temperature, DO, and/or pH. .................... 27 Table 16. Runoff approximation summary for Adams Creek (East). ....................................................................... 29 Table 17. Runoff approximation summary for Ayer Creek. ..................................................................................... 29 Table 18. Runoff approximation summary for Black Lake Ditch. ............................................................................ 29 Table 19. Runoff approximation summary for Percival Creek. ................................................................................ 29 Table 20. Approximate existing stormwater TP loads (kg/day) from MS4s. ........................................................... 30 Table 21. Approximate existing urban stormwater TN loads (kg/day) from MS4s. ................................................. 30 Table 22. Approximate existing stormwater TN and TP loads for Black Lake Quarry. ........................................... 31 Table 23. Approximate existing stormwater TN and TP loads for industrial facilities. ............................................ 31 Table 24. Active NPDES permitted construction stormwater permits. .................................................................... 32 Table 25. Nitrogen and phosphorus loads (kg/day) for estimated average daily stormwater flow (cfs). ................ 33 Table 26. Reductions required from existing loads to meet the WLAs. .................................................................. 34 Table F-1. Effective shade targets, deficits, and daily maximum solar heat TMDLs for Ayer Creek. ..................... 37 Table F-2. Effective shade targets, deficits, and daily maximum solar heat TMDLs for Huckleberry Creek. ......... 42 Table F-3. Effective shade targets, deficits, and daily maximum solar heat daily TMDLs for Adams Creek. ......... 59 Table F-4. Effective shade targets, deficits, and daily maximum solar heat TMDLs for Tempo Lake Outlet. ........ 65 Table F-5. Effective shade targets, deficits, and daily maximum solar heat TMDLs for Unnamed Spring to Deschutes River. ..................................................................................................................................................... 66 ii Appendix F - Deschutes River Tributaries TMDLs Technical Analysis Table F-6. Effective shade targets, deficits, and daily maximum solar heat TMDLs for Reichel Creek. ................ 67 Table F-7. Effective shade targets, deficits, and daily maximum solar heat TMDLs for Lake Lawrence Creek. .... 73 LIST OF FIGURES Figure 1. Waterbodies on the 2012 303(d) impaired waters list addressed in this report. .........................................1 Figure 2. NLCD 2011 land use/cover in the Deschutes River watershed with an inset map showing the Adams Creek area north of the watershed. ............................................................................................................................5 Figure 3. Average daily shade deficit along Huckleberry Creek. ............................................................................ 11 Figure 4. Average daily
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